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Commitments and Contingencies - Capital Lease Financing Obligations (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Capital Leases, Future Minimum Payments Due [Abstract]  
2017 $ 21,995
2018 21,393
2019 8,778
2020 3,336
2021 2,457
Thereafter 543
Total payments 58,502
Less: amount representing interest (4,100)
Present value of payments $ 54,402
Minimum  
Capital Leased Assets  
Effective interest rate (less than) (percentage) 1.00%
Maximum  
Capital Leased Assets  
Effective interest rate (less than) (percentage) 9.00%